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path: root/drivers/usb/image/mdc800.c
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Diffstat (limited to 'drivers/usb/image/mdc800.c')
-rw-r--r--drivers/usb/image/mdc800.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/image/mdc800.c b/drivers/usb/image/mdc800.c
index e192e8f7c560..dce4f7b69ac3 100644
--- a/drivers/usb/image/mdc800.c
+++ b/drivers/usb/image/mdc800.c
@@ -96,6 +96,7 @@
#include <linux/module.h>
#include <linux/wait.h>
#include <linux/mutex.h>
+#include <linux/smp_lock.h>
#include <linux/usb.h>
#include <linux/fs.h>
@@ -622,6 +623,7 @@ static int mdc800_device_open (struct inode* inode, struct file *file)
int retval=0;
int errn=0;
+ lock_kernel();
mutex_lock(&mdc800->io_lock);
if (mdc800->state == NOT_CONNECTED)
@@ -660,6 +662,7 @@ static int mdc800_device_open (struct inode* inode, struct file *file)
error_out:
mutex_unlock(&mdc800->io_lock);
+ unlock_kernel();
return errn;
}